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Articles by R.K. Gupta
Total Records ( 5 ) for R.K. Gupta
  A. Tiwari , R.K. Gupta and D.P. Agrawal
  Discovering association rules in huge databases is a core topic of data mining. This survey study aims at giving an overview of the previous researches done in this field, evaluating the current status of the work done and envisioning gaps in the current knowledge. The problem of mining association rules can be generalized in to two steps: (1) Finding all frequent itemsets and (2) generating rules from these itemsets. The first sub-task, which is to determine the frequent itemsets, is computationally expensive process. Counting the occurrences of itemsets requires a considerable amount of processing time. As a consequence, number of algorithms are proposed in literature for mining the frequent itemsets. Present study reviews frequent pattern mining algorithms and other related issues available in the literature.
  R.K. Gupta , Pradeep Kumar , Alka Sharma and R.T. Patil
  Kinetics of color changes of aonla (Emblica officinalis) shreds were investigated using objective colorimetric measurements during drying with different blanching treatments. Kinetic parameters chroma, hue, total color difference, and browning index for the color change were determined using Hunter L, a, b values. The drying process changed all three color parameters (L, a, b), causing a color shift towards the darker region. Parameters L and b decreased and a-value increased during drying. The reaction associated with color change followed zero-order reaction kinetics. The minimum change was observed in the KMS (potassium metabisulphite) blanched shreds.
  R.K. Gupta and R.A. Singh
  Polymer composites of o-tolidine-iodine (1:0.75 molar ratio) charge-transfer complex with polystyrene have been prepared in different weight ratios and characterized by the spectral, structural, thermal and electrical methods. The polymer composites exhibit semiconducting behaviour, having the thermal activation energies in the range of 0.18 to 0.49 eV. The current-voltage characteristics, frequency dependence of conductivities of these composites have been determined. The frequency dependence of ac conductivity of these composites showed contribution from grain, grain boundary and electrode as a function of charge-transfer content. At low charge-transfer content, all the three contributions were present but at high content, only grain contribution was observed.
  R.K. Gupta , S.K. Singh and R.A. Singh
  Charge-transfer complexes have been extensively used as cathode materials in fabrication of solid-state organic batteries. However, the low mechanical strengths of the charge-transfer complexes have restricted their proper application in device formation. The polymer composite of these materials have been prepared and used in fabrication of solid-state organic batteries to overcome this problem. The pressed pellets of the polymer composites of phenothiazine-iodine in poly (vinyl chloride) (PVC) and polystyrene (PS) have been used as cathodes in contact with zinc as anode metal. The electrochemical characterization of these cells such as open-circuit voltages, short-circuit currents, their time and temperature dependence have been studied. The impedance analyses have been done to understand the nature of the electrode reaction.
  R.K. Gupta , J.C. Raina and M.D. Monobrullah
  Optimization of virus yield is crucial for minimizing the cost of production and to perfect its large scale-production using in vivo production system. Therefore, separate experiments were conducted to optimize the inoculum dose, larval age, incubation period, and physical status of the harvested larvae for in vivo Helicoverpa armigera nucleopolyhedrosis (HaNPV) mass production. Seven to eight day old larvae treated with an inoculum dose of 1x104 resulted in maximum POBs yield/insect coupled with the desirable proportion of larval harvest and shall therefore be considered as suitable stage for optimum virus production with an incubation period of 7 days. While comparing the HaNPV productivity on the basis of the physical status of the harvested larvae, the maximum POB yield per larva was obtained by harvesting the dead larvae. However, harvesting dead larvae was very difficult and there was high microbial contamination. Thus harvesting moribund larvae was the best option for optimum production of HaNPV.
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